Hi guys, I've got a calorex heatpump dating from 89' and its on R502. The compressor is duff and i've been advised by calorex that a R407C compressor along with a new TEV will get it up and running again.
They have advised running the system on R407C but i would think that R22 would be better considering the old system ran with mineral oil and R502.
Opinions please

Cheers Jon